Lock-nut



S. D. SPRONG. LOCK NUT. APPLICATION FILED APR. 12, 1918.

Patented July 22, 1919.

5 m 02 w loz I $1 5S (IMO 01421 SEVERN D. SPROIN'G, OF BROOKLYN, YORK.

LOCK-NUT.

Specification of Letters Patent. Patented July 22, 1919.

Application filed April 12, 1918. Serial No. 228,079.

To all whom it may concern:

Be it known that I, SnvnnN D. SPRONG, a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, haveinvented a certain new and useful Improvement in Lock-Nuts, of which thefollowing is a specification.

The invention is a lock nut. The problem here solved is to devise a nutwhich shall be self-locking upon its bolt, and yet be integral'or, inother words, free from any additional and separate parts, upon thepresence of which its locking depends. The mode of organization is suchthat when the nut is set up on its bolt and against an abutmentreceiving said bolt, it shall undergo such a change in form as that itsthreaded opening shall become constricted upon said bolt, and thus .sotightly jammed thereon that it cannot work loose.

In the accompanying drawings- Figure 1 is a plan view of my lock nut. Fg. 2 is a section on the line 2, 2 of Fig. 1. Fig. 3 is a plan view ofmy lock nut, showmg the channels as disposed in a nut of hexagonalshape.

Similar letters of reference indicate like parts.

A is a metal nut having the usual inter nally threaded bolt-receivingopening. On one face of the nut is a concentric concavity forming acircular rib B on said face. In the opposite face are formedintersecting transverse channels C, D, referably at right angles to andbisecting t e res ectivetsides of said nut. The depth of sai channels isto be such as to leave an undivided portion E of the nut between thebottoms of said channels and the circular rib B. In Fig. 2, I show thedepth of said channels as about equal to the depth of the midividedportion E, but these relative dimensions may varied, as will hereafterappear. Wh re the nut is of polygonal shape other than square,

the number of transverse channels is to be inin which plate the bolt K,having a threa ed end portion, passes. The nut being applied to said endportion and set up to force rib B against the plate, the central portionof the nut engaging the bolt threads moves onwardly--while the rib, byreason of its contact with plate I, is held stationary. The

channels C, D then permit the nut to assumethe concavo-convex form,substantially as represented by the dotted lines in Fi 2, thusconstricting the threaded portion 0 the nut upon the bolt, or, in otherwords, causing the nut to jam upon its bolt so tightly that it cannotwork loose.

With respect to the relation between the corresponding dimensions of thechannels C, D and the undivided portion E, it will be obvious from theforegoing that all thatis required is that the relativedepths shall besuch as to allow of the constnction of the nut upon the bolt, as alreadydescribed.

I claim:

A nut having on one face an outer concentric circular rib andintersecting channels in its opposite face.

In testimony whereof I have affixed my signature in presence of twowitnesses.

sEvEnN 1). SPRONG.

